c++ multimap只遍历key

在给定的代码示例中，使用了multimap容器来存储键值对。如果你只想遍历multimap中的键，可以使用下面的方式：

multimap<string, int>::iterator it;
for (it = m_map.begin(); it != m_map.end(); ++it)
{
    cout << it->first << endl;
}

在这个循环中，我们使用迭代器it来遍历multimap容器，it->first表示当前键的值。通过输出it->first，我们可以只遍历并打印multimap中的键。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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